Question

a solid has bcc structure. the distance of nearest approach is between the atoms is 1.73 angstrom. find the edge length?

Answer 1

For Body centered cubic (bcc) relation between radius and edge length is given as,
$r=\frac{\sqrt{3}}{4}a$
r = radius or distance of nearest approach between atoms
a = edge length
Given: r = 1.73 Å
$a=\frac{4}{\sqrt{3}}r=\frac{4}{\sqrt{3}}\times 1.73=4\AA$
Hence edge length is 4 Å